Right now the only thing you can do is to supply your own Source for marks.
I do plan to add more options to the default marks source -- you can create
a feature request on Mantis to prod me ;-)
In particular, I what to know how would you like to set the number of marks --
by stating fixed number, minimum/maximum distance between marks,
some other means?
For this example, could you detail the Source strings for marks at 1,10,100, and 1000?
In general, I find the marks for linear plots to work just fine for me. However, for log plots I would like to have marks at each power of 10 starting just below the minY and continuing to just above maxY. For example, if minY=4.1 and maxY=41000, I would like marks at 1,10,100,1000,10000, and 100000.
Many thanks for your help.